You're familiar with the recently buzzed about blog, Letters of Note, right? It's a fun site, run by Shaun Usher, who created it as "an attempt to gather and sort fascinating letters, postcards, telegrams, faxes, and memos." It features things like famous people writing to other famous people about famous things, historically important documents of all sorts, and pieces of writing made funny in hindsight. That latter category wound up sharing with the world a bit of an embarrassment for the Museum of Modern Art late last week, when the site published a rejection letter they had sent to Andy Warhol in the mid-1950s. The museum was turning down the now-famous artist as he tried to donate a piece from his "Shoes" series. Although the letter has appeared in books and elsewhere on the internet, the growing popularity of Letters of Note brought it out in the limelight again, which led to the museum having to shrug if off and once again regret this long-ago decision. But what can you do, right?